Abstract
Abstract A diurnal cycle in temperature and vertical displacement variance has been observed in the stratified region below the surface mixed layer using moored time-series data at 0°, 140°W for there periods: November 1984, April 1987, and May–June 1987. The November 1984 and April 1987 periods coincided with the TROPIC HEAT and TROPIC HEAT-2 experiments, during which direct measurements of turbulent dissipation rates were made near the mooring site. In May–June 1987, a special set of moored time series were collected between 30-m and 61-m depth with 1-minute temporal resolution in addition to standard measurements at 15-minute resolution. The high-resolution data indicated the existence of a diurnal cycle in variance that was most pronounced at frequencies of 10–30 cph and that was coherent over the 31-m extent of the vertical array. It is likely that this diurnal cycle in variance was due in part to internal waves remotely generated at the base of the nighttime mixed layer and that the appearance of in...
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